Olympus MX61L Manuel d'assemblage - Page 24

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AS (Aperture Stop) PRESET Switch Setting (Fig. 30)

}The AS PRESET switches ² are used to preset the AS (aperture stop) value for each objective so that the opening of the

aperture iris diaphragm can be switched in an interlocked operation to the objective switching.

In the darkfield observation, the aperture iris diaphragm is fixed automatically at the open position.

The positions of the AS PRESET switches can be changed while the main switch is set to " " (ON).

Setting the AS values

Insert a flat-blade precision screwdriver into the AS PRESET switch ² corresponding to the number of the objective

mount thread accommodating the desired objective, and turn the switch so that its arrow points the desired AS value.

(See Table 1 for the recommended values.)

AS interlocking

· When using the U-HSTR2 hand switch:

When the objective switching button on the hand switch is pressed, the objective is switched and, at the same time, the

AS value is set to the value set for the new objective. If the AS switch position is changed while the main switch is set to

" (OFF), the new AS value will be applied to each objective after the main switch is set to " " (ON).

· When using computer control through the serial interface (RS-232C):

When the request command (1OBA

value to the set value.

PRESET

Switch

Setting

(Notes)

n) is input, the objective is switched at the same time as change of the AS

Table 1 Recommended Settings of the AS PRESET Switches (Positions marked ¦)

MPLFLN/UMPlanFl Series

MPLFLN-BD/UMPlanFl-BD/MPlanFl-BD Series

10X

20X

· The recommended AS values correspond to between 70% and 80% of the objective

pupil diameters. As a result, if the aperture iris diaphragm is stopped down below the

recommended value (toward "D"), the observation image will be glaring.

· When using an objective not in the objective list, set the objective pupil diameter at 70%

to 80%.

· Setting "0" inhibits the interlocked change of the AS value. Although the switch setting is

set at "0", the AS value becomes open when brightfield observation is switched to darkfield

observation. On the contrary, the AS value remains open when darkfield observation is

switched to brightfield observation.

· With fluorescent light observation, set the AS value to "1" (AS open).

LMPLFLN/LMPlanFl Series

LMPLFLN-BD/LMPlanFl-BD Series

50X

100X

10X

AS interlocking not available

Not used

(Note) The factory settings are all 0.

UMPlanApo Series

UMPlanApo-BD

Series

20X

50X

100X

150X

250X